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<a name="strtoull"></a>
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<div class="header">
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<p>
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Next: <a href="wcsrtombs.html#wcsrtombs" accesskey="n" rel="next">wcsrtombs</a>, Previous: <a href="strtoul.html#strtoul" accesskey="p" rel="prev">strtoul</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="strtoull_002c-strtoull_005fl_002d_002d_002dstring-to-unsigned-long-long"></a>
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<h3 class="section">2.41 <code>strtoull</code>, <code>strtoull_l</code>—string to unsigned long long</h3>
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<a name="index-strtoull"></a>
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<a name="index-strtoull_005fl"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdlib.h>
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unsigned long long strtoull(const char *restrict <var>s</var>,
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char **restrict <var>ptr</var>, int <var>base</var>);
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#include <stdlib.h>
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unsigned long long strtoull_l(const char *restrict <var>s</var>,
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char **restrict <var>ptr</var>, int <var>base</var>,
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locale_t <var>locale</var>);
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unsigned long long _strtoull_r(void *<var>reent</var>,
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const char *restrict <var>s</var>,
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char **restrict <var>ptr</var>, int <var>base</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The function <code>strtoull</code> converts the string <code>*<var>s</var></code> to
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an <code>unsigned long long</code>. First, it breaks down the string into three parts:
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leading whitespace, which is ignored; a subject string consisting
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of the digits meaningful in the radix specified by <var>base</var>
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(for example, <code>0</code> through <code>7</code> if the value of <var>base</var> is 8);
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and a trailing portion consisting of one or more unparseable characters,
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which always includes the terminating null character. Then, it attempts
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to convert the subject string into an unsigned long long integer, and returns the
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result.
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</p>
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<p>If the value of <var>base</var> is zero, the subject string is expected to look
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like a normal C integer constant (save that no optional sign is permitted):
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a possible <code>0x</code> indicating hexadecimal radix, and a number.
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If <var>base</var> is between 2 and 36, the expected form of the subject is a
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sequence of digits (which may include letters, depending on the
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base) representing an integer in the radix specified by <var>base</var>.
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The letters <code>a</code>–<code>z</code> (or <code>A</code>–<code>Z</code>) are used as digits valued from
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10 to 35. If <var>base</var> is 16, a leading <code>0x</code> is permitted.
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</p>
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<p>The subject sequence is the longest initial sequence of the input
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string that has the expected form, starting with the first
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non-whitespace character. If the string is empty or consists entirely
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of whitespace, or if the first non-whitespace character is not a
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permissible digit, the subject string is empty.
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</p>
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<p>If the subject string is acceptable, and the value of <var>base</var> is zero,
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<code>strtoull</code> attempts to determine the radix from the input string. A
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string with a leading <code>0x</code> is treated as a hexadecimal value; a string with
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a leading <code>0</code> and no <code>x</code> is treated as octal; all other strings are
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treated as decimal. If <var>base</var> is between 2 and 36, it is used as the
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conversion radix, as described above. Finally, a pointer to the first
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character past the converted subject string is stored in <var>ptr</var>, if
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<var>ptr</var> is not <code>NULL</code>.
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</p>
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<p>If the subject string is empty (that is, if <code>*</code><var>s</var> does not start
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with a substring in acceptable form), no conversion
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is performed and the value of <var>s</var> is stored in <var>ptr</var> (if <var>ptr</var> is
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not <code>NULL</code>).
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</p>
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<p><code>strtoull_l</code> is like <code>strtoull</code> but performs the conversion based on the
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locale specified by the locale object locale. If <var>locale</var> is
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LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
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</p>
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<p>The alternate function <code>_strtoull_r</code> is a reentrant version. The
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extra argument <var>reent</var> is a pointer to a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>strtoull</code>, <code>strtoull_l</code> return the converted value, if any. If no
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conversion was made, <code>0</code> is returned.
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</p>
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<p><code>strtoull</code>, <code>strtoull_l</code> return <code>ULONG_LONG_MAX</code> if the magnitude
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of the converted value is too large, and sets <code>errno</code> to <code>ERANGE</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>strtoull</code> is ANSI.
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<code>strtoull_l</code> is a GNU extension.
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</p>
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<p><code>strtoull</code> requires no supporting OS subroutines.
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</p>
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<br>
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<hr>
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<div class="header">
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<p>
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Next: <a href="wcsrtombs.html#wcsrtombs" accesskey="n" rel="next">wcsrtombs</a>, Previous: <a href="strtoul.html#strtoul" accesskey="p" rel="prev">strtoul</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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